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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd28a56c9b67174535e95e8f79f426d796b9ea82f1f06706af60cdf4a6d3e24a' 
  AND token = '4iMNxcejQgyardwRyat0E8QGHt1W1om3q7Bvmlxswhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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