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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0af9810f3944502c7e17b4180473990ddc7b0e25951111e0d119ab3b2a908b94' 
  AND token = '2xdXsWSzi8vaPDo7nRgszadeH4TubEnpGS69EFYza3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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