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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e73e8933630904109fe158270bf298bb74df12914c8b2ef32a2dc9fe9b2a08c' 
  AND token = '1f9YcTKo9nrl15C4+2/Cums5QBtMdBXWCGF/KtWdhDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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