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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e3c38804b0ac23b93353591c0b4819b26bb31a0cc64b6cc7441cf7f562b443' 
  AND token = 'LaI9ruNuETxKgH7Zy3z6Jtm2DoVPiz6zRWyS90D7GYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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