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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9514f2b58c482f2f21574c9094d5d47d4834bfb5b48ad65ffdf345333cfdd075' 
  AND token = 'V3ByuiKmsbH7ITECAoslIwj/TMoDSIxzOmV6zkNoCcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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