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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf988d0905265f0a0ea732b51bfcb9808c970706713f7f0dffd80cb2e6b8a5c' 
  AND token = 'l+QpYpHUxtpmkp/GlG17xOB0vwArln/gBpdW6lUZlfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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