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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a5020ba6e6386548aec5e633ce7b8c2f8682e851aba38e68cd48f101bf5be0' 
  AND token = 'I0It+OjZW3pPKJB+4THAS6GwFsYgTNFdnakx+GxbO8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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