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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb98cfdcc8f839bda8b3921a2a4b2462f75f77891309da4a12caa79d097b1aa2' 
  AND token = '7fJJhJtWke+2fz7gqJHDIT8XhBeXA3y77EvV5mXMQJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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