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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa103e8950af5e0e90686113c5795782b3f3b385fd83ff9c7d05b327ce558312' 
  AND token = 'jTycqsxqjpni0GDoK6nD2e7Mk3wsca8I5rAFUG4Kj9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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