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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdcd3494e20c1305913d6a2b07c05b8dd90365891155e1cdae064ffd62a687a5' 
  AND token = 'u6zvczJA0Aed/8EDgHhZx9LFu0o93ACsJczGRzLQkQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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