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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889748c504c4a3cc2d6c46e3fb085b8c4795296c0b96f7fa88f97cbb22df98bf' 
  AND token = '2ZGxvSeDI+jOH+yXWMl6rk7+A7qBgtyrI5wBs44QCIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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