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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fedb3d4f5de576b94b7e88470990ecb11570bac5d6e168db7b34d6486ad599d' 
  AND token = '5uGCf08ZOyoBNkcLIasMbobj5W/HGnXobZiW4mGC4wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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