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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7990f1542f738bd1cb76234bf000819ee6ff4b117349b2cd545794e825a22ff' 
  AND token = 'PgP0o+jHuGja7a602BADCeJGy0XQRfiFtsVsZsfI1t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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