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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03bac7255f4a15e4777467c4015bb7f1f0b7ced641efbbaa610bb93233a6c740' 
  AND token = '13b5KWoUTwj/Z91VuqPj2eGPEbM46xYqI/rxA2ixPZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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