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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b484270220e747eac0ce81af82b78296f78241611c056a99be84c3e7eccb5538' 
  AND token = '6D8HSkw0Oi6FhAu7uMZpAYW/Ln/EHucoBOBUyG0CUU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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