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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96fe2d2e12ef3ed83d31f536afb8ed411a704672b8a2be91584979f026f4545' 
  AND token = 'PNY1Bik7iimjlQ+GGi4dNqWhB+RPUsxn5hAyV1aNoOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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