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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b656c9808c31a5a827130bbaa3fd9dc864375cd321c747f2f0addd485d95b9a' 
  AND token = '6BMbBBlpbjyfChOU0jr3rLNDOoJ3NwDUbByIx1nTg+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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