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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7805a7893010ea7b2a46a86052682843cc0fa9460da93c2e9a273c3a6055ff05' 
  AND token = 'iNu7Ltesm0LlFB8S5L1M4yNd2v5SJOjt4/6vesAl/AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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