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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1620c0a7c9c7c2d1e702c75a9b856dac2cc53db71203ef16f7043c22a18e61' 
  AND token = 'cNd1NzLJkOXkD+pvMnuAei6MPAYTazF4FalAQhpuRgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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