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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3633d5ab0359ef4c41ce452b9b59d5c875361ce2e591012348eb4a7a4fbbe42f' 
  AND token = 'OhN+CgGecEOoTumJGoyu6CUKk9so8UGO+bT7PvZZvBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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