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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '212bd05578e9d89079c0b0866b4805747e9d22fa00f6cf19980af1c9363169de' 
  AND token = 'uj/lppa03QoVvnxms8wayCUjUoJm2ywMrxrghcuMx4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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