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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bafc2197e90a5e2d97c238270de57fc69dc07e74fea666dbe187419e514dafa' 
  AND token = 'l8me6UkuATf33Vb2qhzAF4d7XpfogU77UhxBnkTUo8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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