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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba970749315ad42d5f0869e8f8dda614afc27f23c7b3a1e8128c1655822a9c69' 
  AND token = 'x8eDoptVL3vRuw9X9knYV/Uq5T37InpY3KX33YDTT8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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