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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bfa37d524bea0d08215eee5a9278e26727e0ea1055cd6b30cce1da5d3ffbd92' 
  AND token = 'Hxsc7L214/Z9/tDBy6hmB92jsgqol0KZEajtae8SCVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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