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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c694c9cfed963c6d44b5063079a58c7df62d04d76f41c8a89fbb5afaaa45a1' 
  AND token = 'mTjSbikY4h5WHc/ab02Bh+gbQpBe9qJtewu+KxY45i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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