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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c26d77482dd54b55091b1e77503b2d394b82023cfddcd54bde7e008dc6b20cb' 
  AND token = 'tRWbNjO/VRhJWY7NKot6N0b8rEvp9+qcQpES/10k260=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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