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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c331e2edff26b264230472adcc34f7e1de7d11c14e5fe5c57fb1f16bed087305' 
  AND token = 'dtzOe8CuAZMj8WWEuHo44GIt0jQbNV57da2cJtwVog0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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