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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bb2502800e0b5473ef69617dbe11f48d044f196cddbe276b61abb59d76bd8f' 
  AND token = 'ui0M+PWJoTBjAqx/66ro2yL62ke5F0/X/uJjf2tiFMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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