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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d38689e7c6972d2df9382330e3c5cf4c0317e90d4065c669fa8b5c4ac6b6aef' 
  AND token = 'QuFxzmAeDX+e6DkA1cTmCj/b/McPsUanXozku9Eo198=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}