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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa0f356e96d640f8f5a30c9ea7d066dc15beb6d16c9811cc88608cae89e8c82' 
  AND token = 'OewiidCvjrQF6GlR22EnNpuUBbiYJ84Nq9+ancAtMaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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