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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fcd2a7a07272506ecaec9825b580e554f00d5ec99c97e1e903fa559e8480f37' 
  AND token = '03vPMM4TUkNCJwXvCU7wxTrYJ2OhzMMlNePuRHWUN+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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