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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de91a0e5e7d2adcf2e7f990921c00265a73201812858f5a68a24bb5ba8b8d9c' 
  AND token = 'xVHX+Nc76Rreoh7rlibllbMHBM9dau5IpaUqupUj0r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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