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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c89291f78ccee4e7b7cc80ca3914a6e12e60190a1c90bac93991d90f587528' 
  AND token = 'J184E4nVZ7QATWrOnG4gweF5iADVHYvCQf0O0Yezi9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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