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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a865a23ae81d0a6ff60bcd870a2bf1d5105eb0a73f23cd28dfde642a4a6a77' 
  AND token = '0n1VqLpvZWJPWaBqDs5t2kh/WcySeFLr2+RrbeU8VCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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