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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a62fdf181ea4b7165aa8805d500f86e1a0810345d515e608e56e135422dd744' 
  AND token = 'tb3MwNeecy4yirXO4jiBnDQhBMwXqj1kIUUr6Fknhoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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