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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd548c9dc9c90c3ea61db93f23e506fa9b662e4dd770f988876319fd4cb45ce67' 
  AND token = 'in5EmShSmaYTCxCQ3dnzCQ9JyOlkOiN0+iXGW5C+93U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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