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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6b001c88f340b46f7f4ab1d753ab32020c91588d8de0191e18de16f9a8ab13' 
  AND token = 'NXmQ/4ihekmnveiwe8vkQgV8ONfZlYbaKrhSnFBHuCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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