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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2329edcd03108df819f44ac521fa31427edc82d1acdcf4c6ec1f5b1a8ecc71e' 
  AND token = 'v/BPwiiPBnJXsn4WlH+C/zYffLAnU4usbiA+39ErAbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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