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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ff92b9353c27ba64eb5f0e0df06b2902e90df1eae4ac3055446c53eff81463' 
  AND token = 'kClkF/VPIHvP9OLT9jtdeWMieROGE096ZQOUMv+5xEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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