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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aeed5db5ab3f2c5b2fb7c94a65041ea36c58eb5eecc5f0ee93daf57768c0b56' 
  AND token = 'i16dCPj0z9b8GeVy1pdZFnlX5+nJsP9w7e93P7Pw0lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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