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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2900c7a8b6e12863aa3488daaa8d4a26d0ac8766d9555b5e3df6355569df89a5' 
  AND token = '7SOGuKr0h76nZ2Ks+ti0OZuN9Nql9TM9OksgRJEKJSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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