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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86b160a52fa38562a9810b973fe9d4fbe40baaf683b39bf37ae89bc0c626ea9e' 
  AND token = 'keVjq6ELRONIlp6MOw/DjmEfVwBC6ogS2+x0HjmN2dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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