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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83e3d0abf4ae47fe9e144dc182673089072c2c2ef4b884549a89e27358ea6c3' 
  AND token = 'CceiLnh1laKD0f0r0RG5+d1WSooNwhPGDs2Z52fhsew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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