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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336aa2370f9182a6ee858a1cf5230da1c29b6f987fc66eff34f29ca862ff1f67' 
  AND token = '9jSuwUhgureUU3NX8lprah7eAqrfZMaBwVhehlV/6JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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