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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ec207e0afb94726a523175ab68355e4fcb3647cc5e62978209ce72defd157e' 
  AND token = 'hhbGQd09ausSL217XrXEdWWCPM0J8zpNrz0zq12TL+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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