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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36caab814598a7889913df6c38e975a1b11683c09c45ec9761f6e4b363b39d3' 
  AND token = '5OaOYbHlOg3/Hu9ihakz2eHN15fKEZRiR6mfe5WZ9sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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