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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dce6ef368386ff21ad1ba557e6ff5ec70118799616f2a09c8adaea625df3eb6' 
  AND token = 'hG5o5BIVpAV3R9ShgDNbVDJQUdDaTkheIHLysBFj55M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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