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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6f8348435c6ec428bd3f6473d91d25bc2fb8882eb324296992286964bfa679' 
  AND token = 'OVAn5E+E86CdfvkY3xhW7MwvnK+bZTR4vcVpAGAwQVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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