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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adac044e9c8d3b4e268d9bf9446d8b7455939a4c06d11800f803a71d284efa76' 
  AND token = 'A3j+meCraIhJ85uq4BNMfgl97MZSUV2tofXqmHUf9mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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