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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb3e3b4203741d0c3b5ea56157dda3606c979f9cbbb1a8211a5744b980ce7e5' 
  AND token = '1jq+mWcraysz5eS56yHx/COouFvUVuTNgzPR3g+/pwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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