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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55fb918a131feb362d898b40b7520f53942c617c06adcd05eb36765e74009db' 
  AND token = 'Ozr74hF0MCwMD9m51cCKf9Zx0gyf0vzQn2bgwTreUiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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