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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ab9f2fb5253ff67fb93fbf1f99a1d2aa63b9d3f5e49679f4a29cf60aad2a92' 
  AND token = 'tRZtSwKSpYjpZ22wWCsLdjexuxDtDoWGuyL4HC+SeSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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