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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6408d777cd74572f51ec35fa10fab6ce156f601af57706025b6344c89f9d57a' 
  AND token = 'HA3CwHdE8SHCmF+K7sXO0O/Ysru5UZ8g6RBJ1l3azYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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