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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704f314a9751d14ae35cafd6d4eb033aabf6f51770f3104d3ee3a7223ac916f9' 
  AND token = 'F8oA+XChUMzSByWMJro+Wemy7XfM/VmvbNsDR8fNQyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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