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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9185ba13d2d42b74d3501080ed171102fec94bb4e512ded9ce55fb79536a76' 
  AND token = '9PX3Z6nNS018Kt1LNCiqA41K39/UJSTchujL+w2eS2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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