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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb1aed295725af15fb92d96d577054bbee82f82f4e3d5ec590f74ed020a2f47' 
  AND token = '7ReXTJSmjNhCUaR3pgDxOjMBKEbn/toTjwXHFqq2bpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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