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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7f8b5412f1c8a5bb90b035775117e1dd24d8901cf455cc147ddf61863ebf7e' 
  AND token = 'tPANELWuEHOSPcgQ4U6Pv9Wg8WV1uCpbFpLQayjQxVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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