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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c4a187f7153a1a3f4cca6ff92cbd909c1931659e819ebaa0a0dfe252646f7b' 
  AND token = '+m9gBD0YypngockPnawRreP/fpOg2RIt1hayGj2P48g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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