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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1651c107e90472165e55b6ae3673321e3a7304e93320886aaa662b58b2a58090' 
  AND token = 'kH/yjLK+ZUejQKqwzVCRGtyxnXIfb5IDdwE9SAgz7Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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