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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0946842d2598816591cf0fb054bddbd0fde1f3206374c14ee4b71e0cb736bbcc' 
  AND token = 'TAC0PN4pCoA5iJ+dOOEa+xDI/VW0agjoVrA9vg/1l/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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