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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd3fa2064f5e6fd7fbcbb3af0fd0d5ee2574dd4110658fa7810aee0a72c859f1' 
  AND token = '7aBVgQhdWryO7zoq/g7Jb34MgrStah3u+vbBNDkMI7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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