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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f695d4faa3e097bd774c440e71f4386e27327ffd38548f9f02c11f1355507239' 
  AND token = 'vEL8f3Y3F1dD1LsdbH2/YgnBWjmevXdHHJxcIQMH5x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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