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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab06e6c3fa09e4e559c440997fa5be1abd2d1f4061d4e87344ce01f1a720d46a' 
  AND token = 'IxhmLih6RqJMVabClPJwCU+ky4PAcqqUy6ObuxJfSoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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