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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59baa9c87f8ee8c5ec518697658939ca541cb2f93674cfa4c07b3f00e338e6c4' 
  AND token = 'KQKHG0EHU31ugM/F3nPQuTadVy6Fz/tcBD1t+hsW+Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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