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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f86a0902674a28dd317c46b4a7ef8bc733b6dd52a43ac5029787b1bb0532a7' 
  AND token = 'CYBeQekgvyz/6JE00NdpI8S5mDBwA2KZryGdNwk7wA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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