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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74d8b502031a08b82d94b784b92d3b702c90bc63eb9d3e21e3292f933bf46af' 
  AND token = 'wZhpzbCDAL7N9XDAKoEdFjqmaLo3sTY7qF/kfLel8UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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