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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7947a64bff4b7a66c2fe8d49be8ebc0288de0c614853b95d98db6e2154e76ab6' 
  AND token = 'IT36aCe4nP5OZMkuaGWU92WPWMB5xzPQsaz9YqX/nU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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