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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833bbe35e5b36416c4587c64adbe1e1ea4dfe743f2fec235cc5043147c73b47d' 
  AND token = 'WkIS7laPiqyv4pliy5On1CPGB72rtky4DZIRyJriZ1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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